It is unfortunate that by the time many people notice a change, the message ages out of the Message Center and is no longer available. I shared MC365786 with myself via email in early May 2022, and the item was probably posted around the time the Exchange Team blog post originated. If some tenants were still pending as of January 2023 (or are still) I would hope that the Message Center item remained for them and was updated, but since those can be different across tenants I can't say what others are seeing or should.
It is stuff like this (and especially the Basic Authentication deprecation) that has made me more diligent about monitoring the Message Center, but it is a struggle given the high volume of changes communicated. Microsoft has tried to add some tags to make it easier to focus on what might be important to you, but I don't find them particularly time-saving. I experimented with connecting the MC to Planner to make them into tasks that can be routed to different individuals since I'm not the expert on everything, but that turned out not to be a workable solution for our organization either and the tasks quickly grew unmanageable. The other problem is with the constantly-slipping rollout dates so I have no way of knowing when a change will actually hit our tenant, or when it has unless it's very visible to me. They're working on providing rollout information, but I haven't seen it yet even for the limited services they're starting with.